<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8" />
  <meta http-equiv="X-UA-Compatible" content="IE=edge" />
  <meta name="viewport" content="width=device-width, initial-scale=1.0" />
  <link rel="stylesheet" href="./css/inputnumber.css" />
  <link rel="stylesheet" href="./css/index.css" />
  <title>购物车</title>
</head>

<body>
  <div class="app-container" id="app">
    <!-- 顶部banner -->
    <div class="banner-box"><img src="http://autumnfish.cn/static/fruit.jpg" alt="" /></div>
    <!-- 面包屑 -->
    <div class="breadcrumb">
      <span>🏠</span>
      /
      <span>购物车</span>
    </div>
    <!-- 购物车主体 -->
    <div class="main">
      <div class="table">
        <!-- 头部 -->
        <div class="thead">
          <div class="tr">
            <div class="th">选中</div>
            <div class="th th-pic">图片</div>
            <div class="th">单价</div>
            <div class="th num-th">个数</div>
            <div class="th">小计</div>
            <div class="th">操作</div>
          </div>
        </div>
        <!-- 身体 -->
        <div class="tbody">
          <!-- <div class="tr active" v-for="({id,icon,isChecked,num,price},index) in fruitList" :key="id"> -->
          <div class="tr" v-for="(item,index) in fruitList" :key="item.id" :class="{active:item.isChecked}">
            <div class="td"><input type="checkbox" v-model="item.isChecked" /></div>
            <div class="td"><img :src='item.icon' alt="" /></div>
            <div class="td">{{item.price}}</div>
            <div class="td">
              <div class="my-input-number">
                <button class="decrease" @click="jian(index)" :disabled="item.num<=1"> - </button>
                <span class="my-input__inner">{{item.num}}</span>
                <button class="increase" @click="add(item.id)"> + </button>
              </div>
            </div>
            <div class="td">{{item.price*item.num}}</div>
            <div class="td"><button @click="del(item.id)">删除</button></div>
          </div>
        </div>
      </div>
      <!-- 底部 -->
      <div class="bottom">
        <!-- 全选 -->
        <label class="check-all">
          <input type="checkbox" v-model="allSelected" />
          全选
        </label>
        <div class="right-box">
          <!-- 所有商品总价 -->
          <span class="price-box">总价&nbsp;&nbsp;:&nbsp;&nbsp;¥&nbsp;<span class="price">{{sum}}</span></span>
          <!-- 结算按钮 -->
          <button class="pay">结算( {{total}} )</button>
        </div>
      </div>
    </div>
    <!-- 空车 -->
    <div class="empty" v-if="fruitList.length<=0">🛒空空如也</div>
  </div>
  <script src="https://cdn.bootcdn.net/ajax/libs/vue/2.7.14/vue.js"></script>
  <script>
    const app = new Vue({
      el: '#app',
      data: {
        // 水果列表
        // fruitList: [
        //   {
        //     id: 1,
        //     icon: 'http://autumnfish.cn/static/火龙果.png',
        //     isChecked: true,
        //     num: 2,
        //     price: 6,
        //   },
        //   {
        //     id: 2,
        //     icon: 'http://autumnfish.cn/static/荔枝.png',
        //     isChecked: false,
        //     num: 7,
        //     price: 20,
        //   },
        //   {
        //     id: 3,
        //     icon: 'http://autumnfish.cn/static/榴莲.png',
        //     isChecked: false,
        //     num: 3,
        //     price: 40,
        //   },
        //   {
        //     id: 4,
        //     icon: 'http://autumnfish.cn/static/鸭梨.png',
        //     isChecked: true,
        //     num: 10,
        //     price: 3,
        //   },
        //   {
        //     id: 5,
        //     icon: 'http://autumnfish.cn/static/樱桃.png',
        //     isChecked: false,
        //     num: 20,
        //     price: 34,
        //   },
        // ],
        fruitList: JSON.parse(localStorage.getItem('myData')) || [
          {
            id: 1,
            icon: 'http://autumnfish.cn/static/火龙果.png',
            isChecked: true,
            num: 2,
            price: 6,
          },
          {
            id: 2,
            icon: 'http://autumnfish.cn/static/荔枝.png',
            isChecked: false,
            num: 7,
            price: 20,
          },
          {
            id: 3,
            icon: 'http://autumnfish.cn/static/榴莲.png',
            isChecked: false,
            num: 3,
            price: 40,
          },
          {
            id: 4,
            icon: 'http://autumnfish.cn/static/鸭梨.png',
            isChecked: true,
            num: 10,
            price: 3,
          },
          {
            id: 5,
            icon: 'http://autumnfish.cn/static/樱桃.png',
            isChecked: false,
            num: 20,
            price: 34,
          },
        ],
      },
      methods: {
        add(id) {
          // for (let key in this.fruitList) {
          //   if (id == key) {
          //     this.fruitList[key].num++
          //   }
          // }
          for (let [index, val] of this.fruitList.entries()) {
            console.log(index, val.id, id);
            if (id == val.id) {
              this.fruitList[index].num++
            }
          }
          // let numObj = this.fruitList.find(item => {
          //   return item.id == id
          // })
          // numObj.num++
        },
        jian(id) {
          for (let key in this.fruitList) {
            if (id == key) {
              this.fruitList[key].num--
            }
          }
        },
        del(id) {
          this.fruitList = this.fruitList.filter(item => item.id !== id)
        }
      },
      computed: {
        allSelected: {
          get() {
            return this.fruitList.every(item => item.isChecked == true) && this.fruitList.length !== 0
          },
          set(isChecked) {
            this.fruitList.forEach(item => {
              item.isChecked = isChecked;
            });
          }
        },
        total: {
          get() {
            return this.fruitList.filter(item => item.isChecked == true).reduce((prev, next) => prev + next.num, 0)
          },
          set(value) {
            // console.log(value);
          }
        },
        sum: {
          get() {
            return this.fruitList.filter(item => item.isChecked == true).reduce((prev, next) => prev + next.price * next.num, 0)
          },
          set() { }
        }
      },
      watch: {
        fruitList: {
          deep: true,
          handler(newValue, oldValue) {
            // 实现本地持久化
            // localStorage
            // console.log(newValue);
            localStorage.setItem('myData', JSON.stringify(newValue))
          }
        }
      }
    })
  </script>
</body>

</html>